Steam delivery circulation recovery device for paper machine

Abstract

This utility model relates to the field of papermaking equipment technology and discloses a steam conveying and recycling device for a papermaking machine, including a steam conveying pipe, a drying cylinder, and a residual steam pipe. One side of the steam conveying pipe is fixedly connected to one side of the drying cylinder, and one side of the residual steam pipe is fixedly connected to the outside of the drying cylinder. A conveying assembly is provided on the outside of the residual steam pipe, and a support assembly is provided on the outside of the drying cylinder. The conveying assembly includes a check valve, an induced draft fan, an L-shaped rod, and a spiral heating wire. The side of the residual steam pipe away from the drying cylinder is located inside the front side of the check valve. Steam is supplied to the drying cylinder through the steam conveying pipe, and the residual steam pipe, in conjunction with the conveying assembly, recovers the residual steam. The check valve can prevent the residual steam from flowing back and avoid steam waste. The induced draft fan can enhance the conveying power of the residual steam, conveying the residual steam into the steam conveying pipe, and then re-entering the drying cylinder with the new steam, thereby improving the residual steam recovery rate. The spiral heating wire is sleeved on the outside of the L-shaped rod and can heat the steam inside the L-shaped rod, preventing steam condensation due to low temperature.

Description

Technical Field

[0001] This utility model relates to the field of papermaking equipment technology, and in particular to a steam conveying and recycling device for papermaking machines. Background Technology

[0002] The drying cylinder is a key component in the steam conveying device of a papermaking machine, used for drying paper. The drying cylinder is a hollow cylinder made of cast iron with lids at both ends, consisting of a cylinder body and cylinder lids at both ends. The function of the drying cylinder is to dry the moisture in the paper and smooth the paper surface.

[0003] The applicant discovered through a search that a Chinese patent discloses a "Steam Conveying and Recycling Device for Paper Making Machines," with publication (announcement) number "CN216129895U." This patent mainly uses a first heat exchanger to further heat and vaporize the steam output from the steam outlet, thereby further filtering out moisture from the steam and making the steam vaporize more fully, thus improving the quality of the steam. When the steam enters the drying cylinder for condensation, it releases more heat, thereby increasing the temperature of the drying cylinder, thereby improving the utilization rate of steam, reducing steam consumption, and thus reducing production costs. However, the existing devices can only collect the condensate produced in the drying cylinder of the paper making machine during operation. The residual steam produced by the device is not collected. Since the residual steam itself contains high-temperature water vapor, direct discharge will not only waste heat energy but also pollute the environment. Therefore, we propose a steam conveying and recycling device for paper making machines. Utility Model Content

[0004] The purpose of this invention is to provide a steam conveying and recycling device for papermaking machines, in order to solve the problem mentioned in the background art that the existing devices can only collect the condensate produced by the drying cylinder in the papermaking machine during operation, and the residual steam produced by the device will not be collected. Since the residual steam itself contains high-temperature water vapor, direct discharge will not only waste heat energy, but also pollute the environment.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a steam conveying and recycling device for a papermaking machine, comprising a steam conveying pipe, a drying cylinder, and a residual steam pipe. One side of the steam conveying pipe is fixedly connected to one side of the drying cylinder, and one side of the residual steam pipe is fixedly connected to the outside of the drying cylinder. A conveying assembly is provided on the outside of the residual steam pipe, and a support assembly is provided on the outside of the drying cylinder. The conveying assembly includes a check valve, an induced draft fan, an L-shaped rod, and a spiral heating wire. The side of the residual steam pipe away from the drying cylinder is located inside the front side of the check valve. The rear end of the check valve is fixedly installed with the induced draft fan. One side of the L-shaped rod is fixedly connected to the outside of the steam conveying pipe, and the spiral heating wire is sleeved on the outer circumference of the L-shaped rod.

[0006] As a preferred embodiment, the L-shaped rod and the end of the spiral heating wire away from the steam pipe are fixedly connected to a first fixing plate, and a second fixing plate is fixedly installed at the air outlet of the induced draft fan, with the right side of the first fixing plate in contact with the left side of the second fixing plate.

[0007] As a preferred embodiment, a second blocking rod is fixedly connected to the outer side of the steam pipe, and a first blocking rod is detachably connected to the upper outer side of the second blocking rod. One side of the first blocking rod is fixedly installed on the left side of the first fixing plate. The second blocking rod and the first blocking rod are sleeved on the outer side of the spiral heating wire, and the spiral heating wire and the L-shaped rod are arranged inside the second blocking rod and the first blocking rod.

[0008] As a preferred embodiment, bolts are threaded through the four corners of the first and second fixing plates, and the left side of the bolts passes through the first and second fixing plates. A nut is threaded through the left side of the bolts, and the right side of the nut contacts the left side of the first fixing plate.

[0009] As a preferred embodiment, the support assembly includes a first support plate, a second support plate, and a protective block. One side of the first support plate is fixedly installed on the outside of the drying cylinder, and the first support plates are arranged in a corresponding manner. A connecting block is fixedly installed on the lower front end of the first support plate, and a connecting plate is fixedly installed on the lower end of the connecting block. The end of the connecting plate away from the connecting block is fixedly connected to the drying cylinder, and the first support plate is fixedly connected to the second support plate.

[0010] As a preferred embodiment, the front side of the connecting block is fixedly connected to the rear end of the second support plate. Multiple support blocks are fixedly installed on the front side of the second support plate, and a protective block is detachably connected to the front side of the second support plate. The side of the multiple support blocks away from the second support plate is respectively located on the outside of the check valve and the induced draft fan. The support blocks, check valve, and induced draft fan are located inside the protective block.

[0011] The technical effects and advantages of this utility model are as follows:

[0012] Steam is supplied to the drying cylinder through a steam delivery pipe, and residual steam is recovered in conjunction with the conveying components through a residual steam pipe. A check valve prevents residual steam backflow and avoids steam waste. An induced draft fan enhances the conveying power of residual steam, transporting it into the steam delivery pipe and allowing it to re-enter the drying cylinder with the new steam, thus improving the residual steam recovery rate and contributing to energy conservation and consumption reduction. A spiral heating wire is fitted around the L-shaped rod to heat the steam inside the L-shaped rod, preventing steam condensation due to low temperature. The first and second fixing plates are securely connected by bolts and nuts, enhancing the installation stability of the L-shaped rod and the induced draft fan. The spiral heating wire is fitted around the first set of railings and the second set of barrier bars, effectively protecting the heating wire from damage by external impacts and preventing accidental burns. The entire device integrates steam delivery, recovery, heating, and protection, significantly improving operating efficiency and stability, reducing energy consumption, and adapting to the continuous production needs of papermaking machines.

[0013] The first support plate is securely connected to the drying cylinder via connecting blocks and connecting plates, forming a multi-point support structure. This effectively distributes the weight load of the check valve and induced draft fan, preventing component displacement due to vibration during equipment operation. The combined design of the protective block and support block provides physical protection for the check valve and induced draft fan, isolating them from external dust and moisture erosion and extending the service life of core components. On the other hand, the support block assists in positioning, ensuring component installation accuracy and improving the operational stability of the device. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0015] Figure 2 This is a schematic diagram of the unfolded structure of the conveying component of this utility model;

[0016] Figure 3 for Figure 2 A magnified structural diagram at point A;

[0017] Figure 4 for Figure 2 A magnified structural diagram at point B;

[0018] Figure 5 This is a schematic diagram of the unfolded structure of the support component of this utility model.

[0019] In the diagram: 1. Steam pipe; 2. Drying cylinder; 3. Residual steam pipe; 4. Conveying assembly; 401. Check valve; 402. Exhaust fan; 403. First fixed plate; 404. L-shaped rod; 405. Spiral heating wire; 406. First barrier bar; 407. Second barrier bar; 408. Bolt; 409. Nut; 410. Second fixed plate; 5. Support assembly; 501. First support plate; 502. Connecting block; 503. Connecting plate; 504. Second support plate; 505. Support block; 506. Protective block. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] Please see the appendix Figure 1 - Appendix Figure 4 A steam conveying and recycling device for a papermaking machine includes a steam conveying pipe 1, a drying cylinder 2, and a residual steam pipe 3. One side of the steam conveying pipe 1 is fixedly connected to one side of the drying cylinder 2, and one side of the residual steam pipe 3 is fixedly connected to the outside of the drying cylinder 2. A conveying assembly 4 is provided on the outside of the residual steam pipe 3, and a support assembly 5 is provided on the outside of the drying cylinder 2. The conveying assembly 4 includes a check valve 401, an induced draft fan 402, an L-shaped rod 404, and a spiral heating wire 405. The side of the residual steam pipe 3 away from the drying cylinder 2 is located inside the front side of the check valve 401. The rear end of the check valve 401 is fixedly installed with the induced draft fan 402. One side of the L-shaped rod 404 is fixedly connected to the outside of the steam conveying pipe 1, and the spiral heating wire 405 is sleeved on the outer circumference of the L-shaped rod 404.

[0022] Steam pipe 1 is connected to the boiler, and the heat generated by the boiler is transported to the interior of drying cylinder 2 through pressure reducing valves, etc. Then, drying cylinder 2 and steam work together to dry the paper. When the heat of drying cylinder 2 does not reach the set value range, check valve 401 connected to residual steam pipe 3 opens, and induced draft fan 402 transports residual steam into L-shaped rod 404. Since L-shaped rod 404 is fitted with spiral heating wire 405, when the spiral heating wire 405 heats, it transfers heat to L-shaped rod 404, preventing water mist from remaining inside L-shaped rod 404 due to heat dispersion, which would corrode L-shaped rod 404. The other end of L-shaped rod 404 is connected to steam pipe 1, which transports the steam inside L-shaped rod 404 into steam pipe 1, so that the steam inside L-shaped rod 404 can re-enter the front part of drying cylinder 2 with the newly produced steam from the boiler, facilitating recycling and avoiding direct discharge that would cause heat loss and environmental pollution.

[0023] The L-shaped rod 404 and the spiral heating wire 405 are fixedly connected to a first fixing plate 403 at the end away from the steam pipe 1. A second fixing plate 410 is fixedly installed at the air outlet of the induced draft fan 402, and the right side of the first fixing plate 403 is in contact with the left side of the second fixing plate 410.

[0024] The first fixing plate 403 and the L-shaped rod 404 are arranged together, and the holes opened on the first fixing plate 403 and the second fixing plate 410 facilitate the L-shaped rod 404 to be set in the first fixing plate 403 and the second fixing plate 410, so that steam can be directly delivered to the L-shaped rod 404.

[0025] A second barrier bar 407 is fixedly connected to the outside of the steam pipe 1. A first barrier bar 406 is detachably connected to the upper outer side of the second barrier bar 407. One side of the first barrier bar 406 is fixedly installed on the left side of the first fixing plate 403. The second barrier bar 407 and the first barrier bar 406 are sleeved on the outside of the spiral heating wire 405, and the spiral heating wire 405 and the L-shaped rod 404 are arranged inside the second barrier bar 407 and the first barrier bar 406.

[0026] The second barrier bar 407 and the first barrier bar 406 are detachably connected, and the second barrier bar 407 and the first barrier bar 406 form an L-shape. The spiral heating wire 405 and the L-shaped rod 404 are located inside the second barrier bar 407 and the first barrier bar 406. The first barrier bar 406 and the second barrier bar 407 can play a blocking role, blocking the heat dissipated by the spiral heating wire 405 inside the first barrier bar 406 and the second barrier bar 407.

[0027] Bolts 408 are threaded through the four corners of the first fixing plate 403 and the second fixing plate 410, and the left side of the bolts 408 passes through the first fixing plate 403 and the second fixing plate 410. Nuts 409 are threaded through the left side of the bolts 408, and the right side of the nuts 409 is in contact with the left side of the first fixing plate 403.

[0028] The four corners of the first fixing plate 403 and the second fixing plate 410 are penetrated by bolts 408 and are threadedly connected inside the first fixing plate 403 and the second fixing plate 410. Then, the nuts 409 are threadedly connected to the bolts 408 to facilitate fixing. The nuts 409 are located on the left side of the first fixing plate 403 so that they can be easily and unobstructedly removed from the bolts 408 during disassembly.

[0029] Specifically, the steam supply pipe 1 is first connected to the boiler, and the boiler steam is delivered to the drying cylinder 2 through the pressure reducing valve. The drying cylinder 2 uses steam to dry the paper. When the heat of the drying cylinder 2 is lower than the set range, the check valve 401 automatically opens, and the induced draft fan 402 delivers the residual steam through the residual steam pipe 3 to the L-shaped rod 404. The spiral heating wire 405 is energized to heat the L-shaped rod 404, preventing the steam from condensing and accumulating water inside the L-shaped rod 404 and preventing pipe corrosion. The residual steam flows back to the steam supply pipe 1 through the L-shaped rod 404, mixes with the new steam, and re-enters the drying cylinder 2 for recycling. The first fixing plate 403 and the second fixing plate 410 are fastened with bolts 408 and nuts 409 to ensure a sealed connection between the L-shaped rod 404 and the induced draft fan 402. The first barrier bar 406 and the second barrier bar 407 form an L-shaped protective space, which concentrates the heat of the heating wire to improve heating efficiency and provides safety protection. When disassembling and maintaining, the fixing plate can be separated by unscrewing the nut 409. The operation is convenient and can effectively reduce heat loss and environmental pollution.

[0030] Please see the appendix Figure 1 and attached Figure 5 The support assembly 5 includes a first support plate 501, a second support plate 504, and a protective block 506. One side of the first support plate 501 is fixedly installed on the outside of the drying cylinder 2, and the first support plate 501 is arranged in a corresponding manner. A connecting block 502 is fixedly installed on the lower front side of the first support plate 501, and a connecting plate 503 is fixedly installed on the lower end of the connecting block 502. The end of the connecting plate 503 away from the connecting block 502 is fixedly connected to the drying cylinder 2, and the first support plate 501 is fixedly connected to the second support plate 504.

[0031] The first support plate 501 is of the same size as the first support plate 501. Since it is fixed to the outside of the drying cylinder 2, it can play a fixing role. Then, the connecting block 502 is fixed to the lower front side of the first support plate 501. The connecting plate 503 is fixed on the drying cylinder 2 and can cooperate with the first support plate 501 to provide support, which can improve the support force and fixing force.

[0032] The front side of the connecting block 502 is fixedly connected to the rear end of the second support plate 504. Multiple support blocks 505 are fixedly installed on the front side of the second support plate 504, and a protective block 506 is detachably connected to the front side of the second support plate 504. The side of the multiple support blocks 505 away from the second support plate 504 is respectively located on the outside of the check valve 401 and the induced draft fan 402. The support blocks 505, the check valve 401, and the induced draft fan 402 are located inside the protective block 506.

[0033] The front side of the connecting block 502 is fixed to the second support plate 504 to provide support. Then, multiple support blocks 505 are fixed on the second support plate 504. The support blocks 505 provide support for the check valve 401 and the induced draft fan 402. Then, the lower end of the protective block 506 is detachably connected to the front end of the second support plate 504. This not only facilitates disassembly, but also protects the check valve 401 and the induced draft fan 402.

[0034] Specifically, firstly, two identical first support plates 501 are fixed to the outside of the drying cylinder 2. Then, the connecting block 502 is fixed to the lower front end of the first support plate 501. One end of the connecting plate 503 is fixed to the connecting block 502, and the other end is connected to the drying cylinder 2. The connection plate 503 cooperates with the first support plate 501 to enhance the support and fixing force. Next, the rear end of the second support plate 504 is fixed to the front of the connecting block 502. Multiple support blocks 505 are installed on the front of the second support plate 504. The check valve 401 and the induced draft fan 402 are placed on the outside of the support blocks 505, and the support blocks 505 provide support. Finally, the protective block 506 is detachably connected to the front end of the second support plate 504 so that it covers the support blocks 505, the check valve 401, and the induced draft fan 402, thus completing the installation and achieving protection.

[0035] The working principle of this utility model is as follows: This utility model is a steam conveying and recycling device for a papermaking machine. First, the steam conveying pipe 1 is connected to the boiler. The steam generated by the boiler is conveyed through the steam conveying pipe 1. During the journey, the steam pressure is regulated by a pressure reducing valve and then precisely delivered into the drying cylinder 2. When the heat inside the drying cylinder 2 is lower than the set range, the check valve 401 connected to the residual steam pipe 3 automatically opens, and the induced draft fan 402 starts, drawing in the underutilized residual steam in the drying cylinder 2 and conveying it into the L-shaped rod 404. The spiral heating wire 405 on the outer circumference of the L-shaped rod 404 is energized and heated, which can prevent the residual steam inside the pipe from condensing and forming water mist residue, and avoid corrosion of the L-shaped rod 404. The heated residual steam is then conveyed along the L-shaped rod 404 to the steam conveying pipe 1, mixed with the fresh steam generated by the boiler, and then re-enters the drying cylinder 2 to participate in drying, thus realizing the steam... Steam is recycled to reduce heat loss and environmental pollution. During this process, the first fixed plate 403 and the second fixed plate 410 are fastened with bolts 408 and nuts 409 to ensure that the L-shaped rod 404 and the induced draft fan 402 are sealed and connected to ensure stable delivery of residual steam. Two corresponding first support plates 501 are fixed to the outside of the drying cylinder 2. The connecting block 502 at the lower front end of the first support plate 501 cooperates with the connecting plate 503 to enhance the support strength. Multiple support blocks 505 are installed on the second support plate 504 in front of the connecting block 502 to provide stable support for the check valve 401 and the induced draft fan 402 and prevent the equipment from shaking during operation. The removable protective block 506 covers the support block 505, the check valve 401 and the induced draft fan 402 to avoid damage to key components by external factors and ensure the overall stable operation of the device.

[0036] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A steam conveying and recycling device for a papermaking machine, comprising a steam conveying pipe (1), a drying cylinder (2), and a residual steam pipe (3), characterized in that: One side of the steam pipe (1) is fixedly connected to one side of the drying cylinder (2), and one side of the residual steam pipe (3) is fixedly connected to the outside of the drying cylinder (2). A conveying assembly (4) is provided on the outside of the residual steam pipe (3), and a support assembly (5) is provided on the outside of the drying cylinder (2). The conveying assembly (4) includes a check valve (401), an induced draft fan (402), an L-shaped rod (404), and a spiral heating wire (405). The side of the residual steam pipe (3) away from the drying cylinder (2) is located inside the front side of the check valve (401). The rear end of the check valve (401) is fixedly installed with the induced draft fan (402). One side of the L-shaped rod (404) is fixedly connected to the outside of the steam pipe (1), and the spiral heating wire (405) is sleeved on the outer circumference of the L-shaped rod (404).

2. The steam conveying and recycling device for a papermaking machine according to claim 1, characterized in that: The L-shaped rod (404) and the spiral heating wire (405) are fixedly connected to a first fixing plate (403) at the end away from the steam pipe (1). A second fixing plate (410) is fixedly installed at the air outlet of the induced draft fan (402), and the right side of the first fixing plate (403) is in contact with the left side of the second fixing plate (410).

3. The steam conveying and recycling device for a papermaking machine according to claim 1, characterized in that: A second barrier rod (407) is fixedly connected to the outside of the steam pipe (1). A first barrier rod (406) is detachably connected to the upper outer side of the second barrier rod (407). One side of the first barrier rod (406) is fixedly installed on the left side of the first fixing plate (403). The second barrier rod (407) and the first barrier rod (406) are sleeved on the outside of the spiral heating wire (405), and the spiral heating wire (405) and the L-shaped rod (404) are arranged inside the second barrier rod (407) and the first barrier rod (406).

4. The steam conveying and recycling device for a papermaking machine according to claim 2, characterized in that: Bolts (408) are threaded through the four corners of the first fixing plate (403) and the second fixing plate (410), and the left side of the bolts (408) passes through the first fixing plate (403) and the second fixing plate (410). A nut (409) is threaded through the left side of the bolts (408), and the right side of the nut (409) is in contact with the left side of the first fixing plate (403).

5. The steam conveying and recycling device for a papermaking machine according to claim 1, characterized in that: The support assembly (5) includes a first support plate (501), a second support plate (504), and a protective block (506). One side of the first support plate (501) is fixedly installed on the outside of the drying cylinder (2), and the first support plate (501) is arranged in a corresponding manner. A connecting block (502) is fixedly installed on the lower front side of the first support plate (501), and a connecting plate (503) is fixedly installed on the lower end of the connecting block (502). The end of the connecting plate (503) away from the connecting block (502) is fixedly connected to the drying cylinder (2), and the first support plate (501) is fixedly connected to the second support plate (504).

6. The steam conveying and recycling device for a papermaking machine according to claim 5, characterized in that: The front side of the connecting block (502) is fixedly connected to the rear end of the second support plate (504). A plurality of support blocks (505) are fixedly installed on the front side of the second support plate (504), and a protective block (506) is detachably connected to the front side of the second support plate (504). The side of the plurality of support blocks (505) away from the second support plate (504) is respectively located on the outside of the check valve (401) and the induced draft fan (402). The support blocks (505), the check valve (401), and the induced draft fan (402) are located inside the protective block (506).

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